Device for reducing standby power and electronic device therefor

1. An electronic device comprising:

a power supply device configured to supply power for driving the electronic device; and

a system device configured to be driven based on the power supplied from the power supply device,

wherein the power supply device comprises:

an AC-DC converter configured to convert AC power, supplied from an external power device, into DC power; and

a connection circuit configured to selectively connect the external power device and the AC-DC converter, based on an operating mode of the electronic device,

wherein the system device comprises:

a connection control circuit configured to control a connection between the external power device and the AC-DC converter via the connection circuit; and

a battery configured to supply power to the connection circuit,

wherein the connection control circuit is configured to block power for driving the connection circuit when the electronic device is switched to a standby mode and supply the power of the battery to the connection circuit when the electronic device is activated, and

wherein the connection circuit is configured to be driven based on the power for driving the electronic device supplied from the power supply device when the power supply device is driven based on the power of the battery supplied in response to activation of the electronic device.

2. The electronic device as claimed in claim 1 , wherein the power supply device is configured to further comprise an overvoltage protection circuit configured to protect an internal circuit of the power supply device from the external power device,

wherein the connection circuit is configured to be disposed between the overvoltage protection circuit and a capacitor of the AC-DC converter.

3. The electronic device as claimed in claim 1 , wherein the connection circuit is configured to:

connect the external power device and the AC-DC converter when the electronic device is activated; and

disconnect the external power device and the AC-DC converter when the electronic device is switched to the standby mode.

4. The electronic device as claimed in claim 1 , further comprising a buck booster configured to be disposed between the battery and the connection control circuit and to boost a voltage of the battery to a reference voltage.

5. The electronic device as claimed in claim 4 , wherein the buck booster is configured to:

be activated when the electronic device is activated; and

be deactivated when the power for driving the electronic device is supplied from the power supply device.

6. The electronic device as claimed in claim 1 , wherein the connection control circuit is configured to:

identify a voltage of the battery when the electronic device operates in the standby mode; and

supply the power of the battery to the connection circuit in order to charge the battery when a charging event occurs based on the voltage of the battery.

7. The electronic device as claimed in claim 1 , wherein the system device further comprises:

a power button;

a processor; and

a booting control circuit,

wherein the connection control circuit is configured to supply the power of the battery to the connection circuit when an input to the power button is detected while the electronic device is operating in the standby mode,

wherein the booting control circuit is configured to provide input detection information of the power button to the processor, based on a time when the connection circuit is activated and thus the power supply device supplies the power for driving the electronic device.

8. The electronic device as claimed in claim 7 , wherein the booting control circuit comprises a delay circuit configured to delay transmitting the input detection information of the power button until the time when the connection circuit is activated and thus the power supply device supplies the power for driving the electronic device.

9. The electronic device as claimed in claim 1 , wherein the connection circuit is configured to include a relay circuit.

10. The electronic device as claimed in claim 1 , wherein the connection control circuit is configured to include a latch circuit.

11. An operating method of an electronic device, the method comprising:

operating using power supplied from a power supply device of the electronic device;

deactivating a connection circuit configured to connect an external power device and an AC-DC converter in the power supply device when the electronic device is switched to a standby mode;

activating the connection circuit, based on power of a battery of the electronic device when an input to a power button is detected while the electronic device is operating in the standby mode;

converting AC power of the external power device, supplied to the AC-DC converter through the activated connection circuit, into DC power using the AC-DC converter;

supplying the DC power to a system device of the electronic device; and

providing input detection information of the power button to a processor of the system device when the DC power is supplied to the system device.

12. The method as claimed in claim 11 , further comprising:

activating the connection circuit, based on power of a battery when a charging event occurs while the electronic device is operating in the standby mode;

converting AC power of the external power device, supplied to the AC-DC converter through the activated connection circuit, into DC power using the AC-DC converter; and

charging the battery, based on at least part of the DC power.

13. The method as claimed in claim 11 , wherein the connection circuit is configured to be disposed between an overvoltage protection circuit, configured to protect an internal circuit of the power supply device from the external power device, and a capacitor of the AC-DC converter.

14. The method as claimed in claim 11 , wherein the connection circuit is configured to include a relay circuit.

15. The method as claimed in claim 11 , wherein the standby mode is configured to include a state in which driving of an operating system (OS) of an electronic device is terminated.